Magneto rotor



Oct. zo, 1942. C, F, REIS 2,299,589

MAGNETO ROTOR Filed Nov. 28, 1939 IIIA Patented ocf.zo,1e42 2,299,589

UNITED STATES PATENT OFFICE MAGNETO ROTOR Curt F. Reis, New York, N. Y.;Adele Reis executrix of said Curt F. Reis, deceased Application November28, 1939, Serial No. 306,567

4 Claims. (Cl. 171-209) The present invention relates to rotors forFigure 6 is a transverse sectional view through magnetos of the typeemploying permanent maga rotor in which the pole shoe laminations havenets, and has for its primary object to generally been omitted, improvesuch structures. Referring to the drawing in more detail and A furtherobject of the invention resides in particularly to Figures 1 to 5inclusive, the the construction of a rotor in which the magnet numeral Iindicates a conventional steel shaft extends transversely of the rotorshat and has on which the rotor parts are mounted and adaptits majoraxis extending through the axis of the ed to have its ends rotatablymounted in the sham casing of the magneto. Diametrically opposite Afurther object or the invention resides in 10 portions 2 of the shaftare preieraoly flattened providing a rotor with a sectional magnet, theto provide interlocking connections with the rotor sections of which maybe formed of cast metal proper in a manner which will later appear. andyet which need not be machined to provide The rotor depicted in Figures1 to 5 inclusive the required Contact between the meeting faces S O thebipolar type, and the magnet Whleh iS of the sections. generallyindicated by the numeral is mounted Another object of the inventionconsists in With its major axis passing through the axis of bindingtogether in intimate contact the sections the Shaft The magnet 3 iSComposed of two of the magnet by the shrinkage of an aluminum sections 4and 5 which are identical in form. or other metal jacket which partlysurrounds the These sections 4--5 are formed of cast metal and assembledmagnet sections. extend substantially the entire length oi' the Anotherobject 0f the invention resides in rotor. It will be understoodtherefore that the drawing laminations or pole shoes into intimatemagnet comprises a relatively large mass of metal contact with the polesof the magnet by the and has a correspondingly high coercive force.shrinkage of a cast aluminum or other metal Moreover, by reason of thefact that the sections jacket; on the rotor, of the magnet are formed ofcast metal it will be A further object of the invention consists inreadily understood that the size of the magnet securing the laminationsof each of the pole shoes sections and likewise the magnetic volume mayin intimate contact with each other without the be easily varied to suitvarying requirements. In use of rivets, thereby avoiding the creation ofthe embodiment of the invention illustrated the eddy currents andcorrespondingly increasing the 'so' outer faces of the magnet sectionsare provided magnetic value of the magnet. with bulges 4 and 5 toincrease the mass of the Another object of the invention consists inpromagnet and likewise its coercive force. viding bulges on the exteriorsides of the magnet The inner faCeS 0f the magnet sections are sectionsso as to increase the mass of metal in the llrleferebly provided Withnelned glOOVeS 5 magnet without unduly increasing the diameter ThesegrOOVeS are adapted t0 receive cast alumiof the rotor, and therebyincreasing the coercive num or other non-magnetic metal for locking theforce or magnetic Value of the magnet, magnet sections in position, asWill be later de- A further object of the invention resides in ascribed, and the inelnation of the grooves is such novel construction bywhich the body of the rotor as to cause the sections to be drawn tightlyt0- is anchored or locked to the rotor shaft to pre- 40 getherventrelative movement between these elements. The sections 4 and 5comprising each rotor Other objects and advantages of the inventionmagnet are mounted on the shaft l as indicated will be apparent from thefollowing description in Figure 3, but before being so installed theirwhen taken in connection with the accompanying contiguous faces arecoated with steel cement 8. drawing, in which, By this means an intimatemagnetic contact be- Figure 1 is a perspective view of the rotor. tweenthe tWO SeCtOnS Of the magnet is provided Figure 2 is a longitudinalsectional View thereof without the expensive Step of machining the sidestaken through the magnet. to provide an accurate mechanical contact.

Figure 3 is a transverse sectional View taken The magnet 3 iS Preferablyprovided with on line 3--3 of Figure 1. 50 laminated pole shoes 9. Theconguration of the Figure 4 is a longitudinal sectional view takenlaminations is best shown in Figure 3. Each on line 4-4 of Figure 3.lamination includes an inwardly directed tongue Figure 5 is aperspective View of one of the l0 Which has a notch Il formed in each ofits sections of the magnet shown in Figures 1 to 4 opposite edges, andthe ends of the laminations inclusive, and are beveled as indicated byreference numeral l2.

ing the sections with their inner faces in abutting relationship. Thegrooves 6 are arranged in inclined positions, and it will be obviousthat the shrinking of the aluminum as it cools will cause the magnetsections to be drawn tightly together and into intimate contact with thesteel cement 8.

The molten aluminum also enters the grooves Il formed in the edges ofthe tongues Il! of the laminations, and in this instance also theshrinking of the cast metal as it cools will cause the laminations to bedrawn into intimate engagement with the ends of the magnet 3. The castmetal also holds the laminations of each pole shoe in intimate contact,thus avoiding the use of rivets for that purpose, thereby preventing the4creation of eddy currents and correspondingly increasing the magneticvalue of the magnet.

The flattened portions 2 on the shaft l cooperate with portions of themagnet to form elongated channels of segmental cross-sectional shape,and the molten aluminum enters these channels and serves to rigidlyanchor the rotor body to the shaft.

The die in which the assembled parts is placed is preferably shaped toprovide the integral discs I of aluminum, the hubs l5, and a covering ISfor the outer side walls of the magnet sections and the ends of the poleshoes.

In the modified construction shown in Figure 6 the sectional magnet 20is identical with that shown in Figures 1 to 5 inclusive, except thatthe laminations have been omitted and the sections of the magnet aretherefore longer and provided with' rounded ends. The means for bindingthe sections of the magnet together, etc., are identical with thoseshown in the construction previously described.

From the foregoing description taken in connection with the accompanyingdrawing it will be apparent to those skilled in the art that I havedevised a novel construction of magneto rotor in which the axis of themagnet extends transverse- 1y of the rotor shaft; that the magnetsections Iare intimately bound together in such a way that any machiningoperations are rendered unnecessary; that the pole shoes are drawn intointimate contact with the poles of the magnet by the shrinking of thecast aluminum; that the bulges formed on the outer Walls of the magnetsections increase the mass of the magnet and consequently its coerciveforce, and that the cast non-magnetic metal which binds the magnetsections and pole shoes also locks the body of the rotor to the shaft soas to prevent relative movement between the parts.

In accordance with the patent statutes I have described what I nowbelieve to be the preferred form of the invention, but it is to beunderstood that various changes may be made in the details ofconstruction without departing from the spirit of the invention, and itis intended that all such changes be included witliin the scope of theappended claims.

What is claimed is:

l. A rotor for magnetos comprising a drive shaft, a sectional magnetcomposed of two Sections of magnetic material, said sections beingdisposed on opposite sides of said shaft in contact with each other andhaving inclined notches in their adjacent faces, and a body of castnonmagnetic material interlocking with the walls of said inclinednotches to draw the sections into intimate contact.

2. A rotor for magnetos comprising a drive shaft, a magnet mounted onsaid shaft and having central recesses in its opposite ends, pole shoesfor the ends of' the magnet, inwardly eX- tending projections formed onthe pole shoes midway between their ends and situated in said recesses,and a body of cast non-magnetic interlocked with the projections on thepole shoes for holding the latter in intimate contact with the poles ofthe magnet.

3. A rotor for magnetos comprising a drive shaft, a magnet mounted onsaid shaft and having central recesses in its opposite ends, pole shoesfor the ends of the magnet, inwardly ex- .l tending projections formedon the pole shoes midway between their ends and having notches in theirside walls, said projections being mounted in the recesses in themagnet, and a body of cast non-magnetic material interlocked with the,notches in said projections for holding the pole f` shoes in intimatecontact with the poles of the magnet.

4. A rotor for magnetos comprising a drive shaft, a sectional magnetcomposed of two sections of magnetic material, said sections beingdisposed on opposite sides of said shaft in contact with each other andhaving inclined notches in their adjacent faces, each end of said magnetbeing formed with a recess in communication with the inclined notches,pole shoes for the ends of thel magnets, inwardly extending projectionsformed on the pole shoes and situated in the recesses, and a body ofcast non-magnetic material interlocked with the projections on the poleshoes and with said recesses.

CU'RT F. REIS.

